Question: Normal distribution: Finding a mean or standard deviation Suppose that the lifetimes of a certain kind of light bulb are normally distributed with a

Normal distribution: Finding a mean or standard deviation Suppose that the lifetimes of a certain kind of light bulb are normally distributed with a standard deviation of 120 hours. If exactly 99% of the bulbs die before 905 hours, find the mean lifetime of the bulbs. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place. hours

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